Take a look at a comparison of the Posiden fight between the original PS3 version of God of War 3 as well as the upcoming God of War 3 Remastered release on the PlayStation 4 (which you can preorder with this link on Amazon):
God of War 3 Remastered will be released on the 14th of July. It is going to support 1080p native resolution and targeting 60 frames per second. The original PS3 version was 720p with a variable frame rate between 30 and 60 fps. Aside from the improved graphics, God of War 3 Remastered also comes with a photo mode where you can pause the game and take in-game pictures.
Sony recently revealed that a lot of Xbox 360 only gamers switched over to the PlayStation 4. With remasters such as God of War 3 Remastered and The Last of Us Remastered, these gamers will be able to enjoy some of the best PS3 exclusives on the PS4 with improved graphics and added features.